WASHINGTON—Supreme Court Justice Ruth Bader Ginsburg was hospitalized Thursday after falling in her office and fracturing three ribs. The injury forced her to miss the morning’s formal investiture of the newest justice, Brett Kavanaugh, conducted before an audience that included President Trump and Senate Majority Leader Mitch McConnell (R., Ky.).

The court said Justice Ginsburg, 85 years old, fell Wednesday evening. “She went home, but after experiencing discomfort overnight, went to George Washington University Hospital...